import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../views/login.vue'
import Home from '../views/home.vue'
import Wellcome from '../views/wellcome.vue'

Vue.use(VueRouter)

const routes = [
  { path: '/', redirect: '/login' },
  { path: '/login', component: Login },
  {
    path: '/home',
    component: Home,
    redirect: '/wellcome',
    children:
      [
        { path: '/wellcome', component: Wellcome }
      ]
  }
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫,to表示将要访问的路径，from表示从哪里来，next是下一个要做的操作
router.beforeEach((to, from, next) => {
  if (to.path === '/login') {
    return next()
  }
  const token = window.sessionStorage.getItem('token')
  if (token === null) {
    return next('/login')
  }
  next()
})

export default router
